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New Exhaust Manifold
Fits 41-53 Jeep & Willys with 4-134 L engine

Part # 801826

New Exhaust Manifold

Newly cast complete exhaust manifold. Bolts up just like original - Highest quality guarantee.

Heat riser kit comes with new shaft, bushings, washer. Acted as an early way of warming up your motor in cold conditions. Opens flap as motor warms.

4-134 L engine

41-45 MB
41-45 GPW
46-49 CJ-2A
49-53 CJ-3A
50-52 M38
46-49 Truck
46-49 Station Wagon
48-49 Jeepster

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Is the counter weight arm installed backwards for shipping purposes, or is how repo is designed to work?

Willys Jeep Parts Tech:
See link with image on diagram:

Is this exhaust manifold NOS or made overseas? Does it come with all gaskets ? Studs?

Willys Jeep Parts Tech:
It does come from over seas and the gaskets are sold separately. That number is A7835. Thanks

Is the flap included

Willys Jeep Parts Tech:
Yes, that is correct.

The rocker-arm of the Heat Riser is missing on my MB, but the shaft is still present in the manifold. Is it possible to purchase the weighted rocker arm separately? or do I have to purchase a whole new Exhaust Manifold?

Willys Jeep Parts Tech:
637219 is the counter weight part number.

Is just the stud off the exhaust manifold available it appears mine sheared at the exhaust connection.

Willys Jeep Parts Tech:
That I would go back and use a standard bolt on.

One of your answers says the only other possible part would be 639743,the valve stop. Mine is good still. So does it come with gaskets then?

Willys Jeep Parts Tech:
A7835 is the part number for that. It is separate.

The heat riser kit doesn't include the flapper according to the pictures. Does the manifold come with a flapper and is the heat riser kit and flapper installed, or are they separate?

Willys Jeep Parts Tech:
The flapper is installed with it. It may just be the way the photo was taken.

does the heat riser kit come as part of the exh. man.?

Willys Jeep Parts Tech:
yes, that is correct, it does.

Do I need to buy any additional parts for the heat riser, or do I just bolt it on as is?

Willys Jeep Parts Tech:
639743 is the only other item i would get to complete the assembly.

In Stock?

Willys Jeep Parts Tech:
Yes, these are.

on the exshast manifold where the tail pipe hooks on, is that a stud that can be replaced?, this is on a 1951 cj 3a, l-134engine. thanks john c.

Willys Tech:
Yes is can be screwed out and replaced if needed.

Hi- I noticed that the hole, closest to the firewall is broken on our jeep. The manifold is sorta jury rigged, but seems to work ok. To replace the manifold, are there just three bolts or is there a hidden middle bolt that is not showing in this picture. -Thanks Peer

Willys Tech:
The intake and exhaust manifolds share bolts so that is correct.
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